Wikipedia
Emaré
Emaré is a Middle English Breton lai, a form of Mediaeval romance poem, told in 1035 lines. The author of Emaré is unknown and it exists in only one manuscript, Cotton Caligula A. ii, which contains ten metrical narratives. Emaré seems to date from the late fourteenth century, possibly written in the North East Midlands. The iambic pattern is rather rough.
It tells a version of the popular "Constance-saga".